Removable antiskid device for vehicle wheels provided with resilient tires



Dec. 1, 1953 H. EISNER REMOVABLE ANTISKID DEVICE FOR VEHICLE WHEELS PROVIDED WITH RESILIENT TIRES Filed March 1l, 1950 "1e-ian. Il

atented ec. i, i953 REMOVABLE ANTISKD DEVICE FCR VEHICLE WHEELS PROVIDED WITH RESILIENT TIRES Harold Eisner, Prangins, Switzerland Application March 11, 1950, Serial No. 149,054

Claims priority, application Switzerland June 8, 1949 1 Ciaim.

This invention relates to a removable anti-skid device for vehicle wheels provided with resilient tires and rmore particularly for motor vehicles in which at least an anti-skid member consisting at least partly of hard sintered metal composition is inserted in a plate which lies in the position of use on the tread surface of the tire.

The object of the invention is to make use of the infallible gripping and non-skidding effect of such hard metal composition on slippery ground, such as sleet, in an anti-skid device, Which will avoid the drawbacks of the hitherto known metallic anti-skid devices, such as for example, the usual snow chains of wrought iron or steel. rEhe properties aimed at to attain consist more particularly in this that the anti-skid device shall cling Well on the pneumatic tire and. protect its surface. The disadvantages of great Weight experienced in connection with the usual snow chains as well as the rapid Wear of the chain li s which come into contact with the road bed are avoided by the fact that the chain links, if they are still provided, are used for the mounting of the anti-skid device only where they do not touch the road bed. Moreover, the properties of the pneumatic tire are imparted to the anti-skid device such as pressure-elasticity and durability, as well as a constitution which renders them equal to the special snow profiled pneumatic tires with their good gripping eiect in deep snow, being, however, superior to them by their ensuring at the same time infallible gripping effect on smooth ice.

The invention consists of a non-metallic pres sure-resilient ilegible band which is placed in the position of use, transversely7 over the tread surface of the tire, the plate being secured thereon in such a manner that the anti-skid member consisting at least partly or the aforesaid hard metal composition projects outwardly over the tread surface of the band.

rubber layer t vulcanised thereon and is of approximately rectangular cross section, so that in the position of use (see Figure l) it shows steplike heels on the tread surface i of the tire. The longitudinal ends oi the band 3 are iixed in posi tion by a chain linkt, 6, bent into a loop l, l and closed by means of rivets 8, S. The chain link e, together with other chain links t, are inserted at equal distances from one another in links s' along adjacent bands 3 to form a chain 9, the ends It and Ii of which are connected together by means of a tension clasp i2 in order that it may, together with the chain on the other side of the tireconnecting together the other loops i', hold the bands 3 firmly onto the tire 2.

The anti-skid member consisting o a shell ifi and a hard metal pin I5 is inserted in a bore i3 on the part of the band 3 lying on the tread surface ofthe tire, and lies with the Wart-like enlarged outer end It of the shell It on the tread surface II of the band 3, the inner end of the shell is being riveted in an annular supporting plate lil lying against the linen backing l of the band 3 so that both the plate and the anti-skid member lie rmly on the band. Their edges, which are in contact with the band, are rounded off. The outer diameter of the supporting plate It is greater than that of the outer end it of the shell I4.

The pin I5, which is preferably of sintered hard metal composition, for instance, one of tungstencarbide base with a hardness of approximately 68 Rockwell C (load 150 kg.) corresponding to 83 to 90 Rockwell A (load 60 kg.) is inserted into the middle of the shell I4, which is provided with a conical bore I9 to receive the conical pin i5 in such a manner that the whole of the peripheral surface of the pin lies in the shell it vand projects outwardstherefrom only with its rounded end surface 2B, so as to form a meniscus or" great resistance to wear.

More than one anti-skid member may be secured in the manner hereinbefore described in-` side the tread surface of the band. The tread surface of the band may be smooth at the point not covered by the anti-slide members or be provided with a profile similar to those of vehicle tires, In order to facilitate replacement of the individual bands, the chain links 6, S', closed in the loops 'I of the bands 3 may be provided each with a hook 2| (Figure 3), by means of which they can be hung into a chain serving as an assembling member.

As shown in Figure fl, the bands 3 may also be individually provided with assembling means, for instance leather belts 22, 23 and connecting buckles 24 riveted onto the longitudinal ends oi the band 3. Such bands can be easily and readily mounted onto suitable Wheels, as for instance spoked Wheels instead of the anti-skid chains, if necessary.

According to Figure 5, the plate 26 supporting the anti-skid member or shell 25 may be arranged on the tread surface il of the band 3 and be riveted onto the annular plate 28 lying against the linen backing 4 of the band, by means of a neck 21 constructed in the form of a hol- 10W rivet so that it lies firmly on the band 3. The shell 25 into which the aforesaid hard metalpin l5 is inserted forms a conical plug `3l) on a `short wart-like rounded head 29, by means of which it is inserted in a removable manner into the conical bore 3| of the neck 21.

Instead of the chain links E, 6 a cable may be inserted through the loops '1, V'I' of a plurality v'of bands 3 comiected together to form an anti-skid attachment, the said cable serving as an assembling member instead of a chain.

What I claim and wish to secure by Letters Patent is:

An anti-skid device for application to a vehicle wheel equipped with a rubber tire having a tread surface; comprising a non-metallic, pressure resilient flexible band having an under surface adapted to extend on and across the tread surface of ksaid tire, a metallic androunded anti'- skid projection extending beyond the tread surface of said band, said projection including a shank having a central conical bore and passing through said band, an annular ange plate con* nected to said shank and riveted at said under surface of said band, said plate being substantially larger in diameter than that of said projection, and a pin consisting vof sintered hard metal composition wedged into said central conical bore and extending beyond said projection a predetermined distancel said pin terminating at one end in a rounded outer frontal surface depending toward said projection, the remainder of said pin being in contact With the Wall dening said bore and terminating with its other end short of the end of said bore adjacent said plate,

said other end of `said pin extending approximately half the height of said hollow shank of said projection.

HAROLD EISNER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,469,666 Raz-Ammann May 10, 1949 2,473,249 Hershman June 14, 1949 FOREIGN PATENTS Number uCountry 'Date 12,781 Great Britain 1906 355,660 France Nov. '9, 1905 '376,619 France Aug. 14, 1907 389,735 France Sept. 16, 1908 407,196 France Feb. 21, 1910 

